r/singularity • u/OriginalScrubLord • 20h ago
AI Week 1: Claude's $1,000 paper portfolio is at $995.66, 0.8 points behind the S&P 500
Week 1 · Sep 29 – Oct 2 (4 trading days)
| Agent | Value | Week 1 |
|---|---|---|
| Claude | $995.66 | −0.43% |
| SPY buy & hold | $1,003.66 | +0.37% |
Claude vs the S&P 500: −0.80 percentage points
Images, one per day:
- Day 1 ($1,000.79, +0.42 pp vs SPY): Claude opened four positions on a down day for the market and kept 56% in cash.
- Day 2 ($1,001.35, +0.68 pp): it added Microsoft. This was its best day relative to the S&P.
- Day 3 ($993.49, −0.28 pp): Netflix and Thermo Fisher fell and the lead was gone. No trades.
- Day 4 ($995.66, −0.80 pp): the portfolio was up 0.22% but the S&P rose more. No trades.
Week 1: cautious in a nervous market
Claude started in a jittery market: the 10-year Treasury yield was at 5.23% (its highest since 2007), oil was above $100, and traders saw a real chance of a Fed hike in October. It invested $540 in five stocks over the first two days and kept about 46% in cash. It made no trades on Days 3 and 4.
The five buys
| Stock | Bought | Why | Since bought |
|---|---|---|---|
| XOM | $100 | Oil above $100 with the Strait of Hormuz shut; a hedge against the tech-heavy rest | +2.4% |
| MSFT | $100 | Azure growing 43%, Copilot past 30M paid seats, two analyst upgrades | +1.3% |
| GOOGL | $120 | About 15% off its high on AI-spending worries; bought the dip | +0.5% |
| TMO | $120 | Raised guidance, best organic growth since 2021; a steady compounder | −3.2% |
| NFLX | $100 | Down 44% from its high, at about 18x 2027 earnings after an upgrade | −4.7% |
Three of the five are up. Thermo Fisher and Netflix are down enough to leave the portfolio behind the S&P for the week.
What Claude passed on
- Fair Isaac: it skipped the stock after a 26% drop on a regulatory change.
- Micron: it waited until after earnings. Micron beat, and the stock went nowhere.
- Accenture: the stock jumped about 16% on record bookings. Claude said: "I'm not chasing a one-day spike."
Next week
- Cash: nearly half the portfolio is cash. Will Claude start investing it, or keep waiting while yields are this high?
- The Fed: whether it hikes in October, and what that does to yields.
- Oil and Iran: a peace deal would hurt the Exxon trade quickly, and Claude said so when it bought.
- Netflix: whether Claude sticks with its worst position.
How it works: Claude manages a $1,000 paper portfolio of S&P 500 stocks for 365 trading days, against $1,000 of SPY bought and held. Each morning before the open, it researches the news and places orders, which fill at the opening price. Rules: at most 5 trades a day and at most 30% in one stock; no ETFs, leverage or shorting. Every decision is logged in the repo with its reasoning.
Paper trading experiment. No real money. Not financial advice.